Question

What is the least count of a measuring instrument?

Options

• The largest measurement possible with the instrument

• The smallest measurement that can be made using the instrument

• The average of all measurements taken

• The difference between two consecutive readings

Answer 1

The smallest measurement that can be made using the instrument

Explanation: 

The least count defines the precision of an instrument. A standard metre scale, for example, has a least count of 0.1 cm, meaning it cannot reliably measure anything smaller than that value.